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On the Development of a Far-infrared Thermal Image Generator

Hooff, C.J.S. van (2015) On the Development of a Far-infrared Thermal Image Generator. Bachelor's Thesis, Physics.

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For the performance characterization of a far-infrared imaging array, a thermal point source image generator is desired. A possible design for this is a square array of resistive heating elements that can be individually controlled. Within this thesis we describe the feasibility of such an image generator. We describe the design, modeling, fabrication and testing of four different 12x12 mm^2 PCBs equipped with 25 SMD thin film resistors of dimensions 1x0.5 mm^2. Measurements with a room temperature thermal camera and an Offner relay system with a cryogenic bolometer operating at 12.5 and 100 µm show good agreement between model and experiment. At room temperature an input power of 1 W results in a rise of 95 °C, in reasonable agreement with finite element numerical modeling. We do find a discrepancy for the temperature rise of the PCB material, probably because we did not take into account the proper thermal resistance of the PCB to the mounting bracket. The thermal time constant of an individual resistor is in the order of 0.1 s, in agreement with Comsol modeling. By measuring the diffraction limited imaging characteristics around 100 µm, we show that the Airy disk is indeed larger than the resistor dimension, so the resistor indeed can be considered a point source.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:07
Last Modified: 15 Feb 2018 08:07

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